O B CURTIS WATER TREATMENT PLANT

NPDES permit MS0046906 · Minor NON-POTW · administratively continued, expires 2026-08-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2026-08-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

24values over a limit
0required values missing, on 0 form(s)
1of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Solids, total suspended (24).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (32)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. CMX MO AV report only all year
001BOD, 5-day, 20 deg. CWKLY MAX report only all year
001BOD, 5-day, 20 deg. CMX MO AV report only all year
001BOD, 5-day, 20 deg. CWKLY MAX report only all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMX MO AV <= 45 mg/L all year
001Solids, total suspendedWKLY MAX <= 67.5 mg/L all year
001Solids, total suspendedMX MO AV <= 1073 lb/d all year
001Solids, total suspendedWKLY MAX <= 1609 lb/d all year
001Nitrogen, total [as N]MX MO AV report only all year
001Nitrogen, total [as N]WKLY MAX report only all year
001Nitrogen, total [as N]MX MO AV report only all year
001Nitrogen, total [as N]WKLY MAX report only all year
001Nitrogen, ammonia total [as N]MX MO AV report only all year
001Nitrogen, ammonia total [as N]WKLY MAX report only all year
001Nitrogen, ammonia total [as N]MX MO AV report only all year
001Nitrogen, ammonia total [as N]WKLY MAX report only all year
001Phosphorus, total [as P]MX MO AV report only all year
001Phosphorus, total [as P]WKLY MAX report only all year
001Phosphorus, total [as P]MX MO AV report only all year
001Phosphorus, total [as P]WKLY MAX report only all year
001Flow, in conduit or thru treatment plantMX MO AV report only all year
001Flow, in conduit or thru treatment plantWKLY MAX report only all year
001Chlorine, total residualMX MO AV report only all year
001Chlorine, total residualWKLY MAX report only all year
001Chlorine, total residualMX MO AV report only all year
001Chlorine, total residualWKLY MAX report only all year
001Solids, total dissolvedMX MO AV report only all year
001Solids, total dissolvedWKLY MAX report only all year
001Solids, total dissolvedMX MO AV report only all year
001Solids, total dissolvedWKLY MAX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states